linux-kernel - [PATCH bpf-next 0/2] bpftool/libbpf: Add probe for large INSN limit

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Message-Id: <20191227110605.1757-1-mrostecki@suse.de>
Date:   Fri, 27 Dec 2019 12:06:03 +0100
From:   Michal Rostecki <mrostecki@...e.de>
To:     bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Michal Rostecki <mrostecki@...e.de>
Subject: [PATCH bpf-next 0/2] bpftool/libbpf: Add probe for large INSN limit

This series implements a new BPF feature probe which checks for the
commit c04c0d2b968a ("bpf: increase complexity limit and maximum program
size"), which increases the maximum program size to 1M. It's based on
the similar check in Cilium, althogh Cilium is already aiming to use
bpftool checks and eventually drop all its custom checks.

Examples of outputs:

# bpftool feature probe
[...]
Scanning miscellaneous eBPF features...
Large complexity limit and maximum program size (1M) is available

# bpftool feature probe macros
[...]
/*** eBPF misc features ***/
#define HAVE_HAVE_LARGE_INSN_LIMIT

# bpftool feature probe -j | jq '.["misc"]'
{
  "have_large_insn_limit": true
}

Michal Rostecki (2):
  libbpf: Add probe for large INSN limit
  bpftool: Add misc secion and probe for large INSN limit

 tools/bpf/bpftool/feature.c   | 18 ++++++++++++++++++
 tools/lib/bpf/libbpf.h        |  1 +
 tools/lib/bpf/libbpf.map      |  1 +
 tools/lib/bpf/libbpf_probes.c | 23 +++++++++++++++++++++++
 4 files changed, 43 insertions(+)

-- 
2.16.4